<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="button" value="按钮" onclick="f1()">
<script>
    //第一种声明方法的方式
  //1.无参无返回值
  function f1(){
    console.log("f1")
  }
  f1();
  //2.有参无返回值
  function f2(name,age){
    console.log(name+":"+age)
  }
  f2("谭",23);
  //3.无参有返回值
  function f3(){
    return "这是返回值"
  }
  let info = f3();
  console.log(info);
  //4.有参有返回值
  function f4(x,y){
    return x*y;
  }
  let result = f4(6,6);
  console.log(result);
  //5.第二种声明方法的方式
  let f5 = function (name,age){
    console.log(name+":"+age);
  }
  f5("张",25);
  //6.第三种声明方法的方式
  let f6 = new Function("name","age","console.log(name+':'+age)");
  f6("吴",60);
</script>
</body>
</html>